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Electric field-induced changes in the ferroelastic behavior of (Na1/2Bi1/2)TiO3-BaTiO3
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-06-15 , DOI: 10.1016/j.jeurceramsoc.2018.06.017
Alexander Martin , Neamul H. Khansur , Kyle G. Webber

In this study, the macroscopic mechanical behavior was characterized for poled and unpoled polycrystalline (1−x)(Na1/2Bi1/2)TiO3-xBaTiO3 (NBT-xBT) for compositions across the morphotropic phase boundary (MPB). Due to a field-induced ferroelectric phase transformation, NBT-xBT compositions near the MPB (x = 6–7 mol%) showed a significant decrease in the coercive stress for electrically poled samples. The apparent difference in mechanical behavior is suggested to be due to an irreversible electric-field-induced transformation to long-range ferroelectric order in the poled samples. The results indicate a significant difference in the critical stresses for the relaxor-ferroelectric transition and ferroelastic domain wall motion, which can have important effects on applications for lead-free ferroelectrics. To further illustrate this, a method was developed to electrically depole NBT-xBT at room temperature, resulting in an unpoled NBT-xBT material with long-range ferroelectric order. Mechanical testing revealed analogous macroscopic ferroelastic behavior to the poled samples, despite the lack of a piezoelectric response.



中文翻译:

电场引起的(Na 1/2 Bi 1/2)TiO 3 -BaTiO 3铁弹性行为的变化

在这项研究中,表征了极化和非极化多晶(1- x)(Na 1/2 Bi 1/2)TiO 3 - x BaTiO 3(NBT- x BT)的宏观力学行为,涉及跨晶相相界的成分( MPB)。由于场致铁电相变,MPB附近的NBT- x BT成分(x = 6–7 mol%)显示出极化样品的矫顽力显着降低。力学性能的明显差异被认为是由于极化样品中不可逆的电场诱导的到长距离铁电有序的转变。结果表明,弛豫-铁电跃迁和铁弹性畴壁运动的临界应力存在显着差异,这可能对无铅铁电器件的应用产生重要影响。为了进一步说明这一点,开发了一种在室温下对NBT- x BT进行电去极化的方法,从而产生未极化的NBT- xBT材料具有远距离铁电有序。尽管缺乏压电响应,机械测试仍显示出与极化样品类似的宏观铁弹性行为。

更新日期:2018-06-15
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